Barton v Armstrong [1976]

Australian case.
Chairman of company threatened MD with death unless
company bought chairman’s shares.
Company did so.
MD sought declaration deed executed under duress and
therefore void.
Privy Council held once it is established threats
contributed to decision of person threatened to enter contract, that person is
entitled to relief, even though contract might have been entered into anyway if
no threats had been made.
[Based on similar rule for deception]